Win somme lose somme

For years, a vivid movie of soldiers going over the top at the Somme, literally haunted me. It was the one soldier, who never even made it across the top..but slumps back dead into the trench. Instantly gone. Or so i thought!! A fellow trombone player told me tonight , that it was all fake and a propaganda film probably shot on location in wales using actors?? All these years duped with clever images? What next...you will be telling me George Gershwin was not married to his lovely wife Ira ????
https://www.theguardian.com/film/2016/jun/10/battle-of-the-somme-cinema-obsession-war